The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- .htaccess (1 member)
- 11th hour (1 member)
- 1999 (1 member)
- 2003 (0 members)
- 2004 (0 members)
- 2005 (0 members)
- 2006 (0 members)
- 2007 (0 members)
- 2008 (0 members)
- 2009 (0 members)
- 2016 (0 members)
- 2016 UK Trip (1 member)
- 2017 (1 member)
- 2018 (0 members)
- 2XXFM (2 members)
- 404 Not Found (1 member)
- ABC (1 member)
- ACS (1 member)
- ACT Greens (2 members)
- ANU (4 members)
- ANU School of Art (1 member)
- A Place of One's Own (10 members)
- A chair in which to sit (1 member)
- Abrolhos Islands (1 member)
- Access to Memory (1 member)
- Activism (2 members)
- Address book (2 members)
- Addressbook plugin (12 members)
- Adnan Issadeen (1 member)
- Aeropress (1 member)
- Air travel (1 member)
- Alain de Botton (1 member)
- Alastair Bonnett (1 member)
- Alcohol (1 member)
- Aldus Huxley (1 member)
- Alternate world (1 member)
- America (1 member)
- And what do you do Mr Gable? (1 member)
- Apple (1 member)
- Applications (1 member)
- Archaeology (1 member)
- ArchiveTeam (2 members)
- Archives (1 member)
- ArchivesWiki (1 member)
- Archiving (19 members)
- Art (2 members)
- Art school (2 members)
- Articles (4 members)
- Artifactory (1 member)
- Arts and Crafts (movement) (3 members)